Crash on mobile

My scene works fine in PC/Mac browser, but in phone ( tried on iOS only/ chrome/safari), scene loads but sometimes, as soon I touch to move it cause the browser to reload, what could be the reason? how can I capture the cause of crash on mobile?

thanks

This is really hard to know but I suspect that for some reason when you touch , the css are trying to resize the canvas putting you in this case : Many Performance Issues With 4.2 and iOS/Mobile

Try hardcoding canvas width height and its style width height just to see if it gets rid of it ?